isosmolar v isotonic

3 posts / 0 new
Last post
jackiemorris01
jackiemorris01's picture
isosmolar v isotonic

I have just posted the following question on the Biochemestry forum site but think that this site might also be helpful.
I am still not sure that I am in the correct forum but wondered if anyone could help me.
I have read a statement that barium sulphate is isosmolar aand as a result would not would not draw water into the  bowel lumen (when used as an enema solution). I can not now find my source and the question has arisen whether it should be isotonic. I do not think the latter is right (in this circumstance) and would welcome any input. I beieve it should refer to BaSO4 solution is isosmolar as the water of the solution would be the isotonic aspect of the statement.
Help, please!
thanks, Jackie 

 

g a
g a's picture
 Hi 

 Hi 

Iso-osmotic solutions have same molarity or osmolarity which may include multiple solutes where as isotonic solutions are those that have same osmotic pressure which in turn means the equal solute concentrations.  

jackiemorris01
jackiemorris01's picture
Thank you Argerine. goodness

Thank you Argerine. goodness knows why it has caught me off guard but I have stuggled with this differnce when trying to appy it to my enema solution. I had obviously taken the term iso-osmolar from somewhere but it is now obvious that I mean isotonic. Thank you again for your reply
Jackie